Seedance 2.5 reference video cost: per input second vs Sume

On Runway's API, a Seedance 2.5 reference video adds cost: it charges per second of output plus per second of input and reference video, with combined video capped at 30 seconds. On Sume, the price is one reservation per job at provider list x 1.25, and Seedance 2.x models accept audio and video references.

I did not find a Sume line that adds a separate per-second charge for the reference. Confirm your exact request against the catalog before relying on that. Sources: Runway's pricing page and Sume's video docs, read 2026-09-30.

How does Runway bill references?

The page lists, for Seedance 2.5: 20 credits per second of output plus 10 per second of input and reference video at 480p; 30 plus 15 at 720p; 68 plus 34 at 1080p. Reference images and audio are free, and there is an 80 credit minimum per generation.

Which references does Sume accept?

Only models whose supported_input_references lists a type accept that type. Audio and video references are honored by the Seedance 2.x models, Wan 3.0, MiniMax H3 and MiniMax H3 Max. seedance-2.5 accepts 4 to 30 seconds at 480p, 720p and 1080p, per the Video Router docs. Check the list in the catalog before sending a reference. Limits are covered in Seedance 2.5 reference limits.

What does Sume reserve for a job?

The Billing row says the workspace USD balance is reserved on submit at provider list x 1.25, for every model. For scale, a 5-second 720p 16:9 seedance-2.5 clip with no reference computes to $2.89 from Sume's pricing code. Whether a reference video changes the amount for your request is something to verify against the catalog and the response's reserved amount, not assume.

How do I keep reference cost predictable?

Trim the reference to the seconds you need, test at 480p first, and read the reserved amount on the first response. Related pricing detail: Seedance 2.0 reference video price.